Perhaps you should try some spelling variations:
"tran dang code snippets" » "tran quang code snippets", "tran hoang code snippets", "tranh hang code snippets", "tran dang cong snippets", "tran dang co snippets", "tran dang de snippets", "tran dang code slippers"
"cong dung code snippets" » "cuong dung code snippets", "cong dong code snippets", "cong luong code snippets", "cong dung cong snippets", "cong dung co snippets", "cong dung de snippets", "cong dung code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("tran dang code snippets") or ("cong dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tran dang code snippets") OR ("cong dung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("tran dang code snippets") or ("cong dung code snippets"))) or ("locating bug code snippets"))*.